Progress in AMS Measurement of 182Hf at CIAE

Accelerator mass spectrometry （AMS） is one of the most promising methods to detect minute amounts of 182Hf. However, the sensitivity of 5×10^-11 for ^182Hf/180Hf obtained previously by the AMS method at China Institute of Atomic Energy （CIAE） cannot meet the requirement of some applications. We present some new improvements of measurement method for AMS measurement of 182Hf at the CIAE HI？13 tandem accelerator system. As a result, a sensitivity of 1.0×10^-11 for 182Hf/180Hf is achieved.     

机械运动能改变放射性同位素的半衰期吗？

采用液闪测量法考察了机械运动对放射性核素^32P的β^-衰变速率的影响．结果表明,在地球北半球的逆时针圆周离心运动条件下（半径10cm,4000r／min）,^32P的β^-衰变速率与自然条件下的衰变速率在测量不确定度范围（0．6％）内没有变化．